linux-kernel - [PATCH 1/3] iio: adc: meson-saradc: Disable BL30 integration on G12A and newer SoCs

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Date:   Sun, 18 Jul 2021 01:37:16 +0200
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     linux-iio@...r.kernel.org, linux-amlogic@...ts.infradead.org
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        lars@...afoo.de, jic23@...nel.org,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Subject: [PATCH 1/3] iio: adc: meson-saradc: Disable BL30 integration on G12A and newer SoCs

G12A and newer don't use the SAR ADC to read the SoC temperature from
within the firmware. Instead there's now a dedicated thermal sensor.
Disable the BL30 integration for G12A and newer SoCs to save a few CPU
cycles when reading samples.
Adding a separate struct meson_sar_adc_data is a good idea anyways
because starting with G12A there's some extra registers to read the
samples in a simplified way.

Signed-off-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
---
 drivers/iio/adc/meson_saradc.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/adc/meson_saradc.c b/drivers/iio/adc/meson_saradc.c
index 66dc452d643a..e140db3e4016 100644
--- a/drivers/iio/adc/meson_saradc.c
+++ b/drivers/iio/adc/meson_saradc.c
@@ -1104,6 +1104,14 @@ static const struct meson_sar_adc_param meson_sar_adc_gxl_param = {
 	.resolution = 12,
 };
 
+static const struct meson_sar_adc_param meson_sar_adc_g12a_param = {
+	.has_bl30_integration = false,
+	.clock_rate = 1200000,
+	.bandgap_reg = MESON_SAR_ADC_REG11,
+	.regmap_config = &meson_sar_adc_regmap_config_gxbb,
+	.resolution = 12,
+};
+
 static const struct meson_sar_adc_data meson_sar_adc_meson8_data = {
 	.param = &meson_sar_adc_meson8_param,
 	.name = "meson-meson8-saradc",
@@ -1140,7 +1148,7 @@ static const struct meson_sar_adc_data meson_sar_adc_axg_data = {
 };
 
 static const struct meson_sar_adc_data meson_sar_adc_g12a_data = {
-	.param = &meson_sar_adc_gxl_param,
+	.param = &meson_sar_adc_g12a_param,
 	.name = "meson-g12a-saradc",
 };
 
-- 
2.32.0